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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '699cfd57c2fdb1b5be09c33ff5aeaea658f265250d2ebc31a4ca36e1b47eae0c' 
  AND token = 'b8d7lLK/6xEKXSom+rpF1y1TLyDwtqRbfoeJbyoE2fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}