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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f71689aefaebb14a5602c7c4cd9809a5f7af32e416be688e59f45e6c29420df' 
  AND token = 'u6Gq7VeeSkkbGhF3vDJPzeY25Kk1AHQNMPwx9ek119k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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