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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2080c4999cd4ff38b000b9b8252f0d2184219992b95d986a97cdc9086e3d2781' 
  AND token = 'pPc5ZGMNbSTrluAZ2wK9QD9u28+3ATawKlJpBCWnIuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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