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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cee256c51b0df5911d770a2b8b36b7c1ba94635b502b3e59991fc0777f55cb8c' 
  AND token = 'FpNDJmJTPCsswF7dWEKVVPZVnc8Y0TgpYigLmDYtyMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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