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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eed886ae25f8fc7136de0e86415b4b8b405835064548c21cb460edc639e3d8a9' 
  AND token = 'pDn66eJCt7u5xkHCEWWHGkSPB6++1Fua6ytEke70D3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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