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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78fe39cba5256b39c9e3615ed8466dea79bfab9587526aea89cbb6a5f9c8e28e' 
  AND token = '53fIG3AgvucpQL7f97oTR6Csjv9XiGuDKTSDuDKxqNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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