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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e47057e77e99a3ec5140aed995c2372007f069694a553f8dbf352efaf8377a83' 
  AND token = 'g1HqMpFpNMmttHJTPiPIqiIoK42eMrt3fG9vDxKCqrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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