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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51f0fd15b07c28c4bd516d4c2a6d839f7acbbb852667ee219889b76ff4a96f67' 
  AND token = '1SdvUxYY/C9wISok005dpI0fnc0a5iSaqoBoL/RDfpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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