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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acd2b62a89074f6b78ffaa8bd430d2241dbce8bd0b86f4832864b9b997a0c77a' 
  AND token = 'iLKdPvaRIC4dTsggNtYLyINnfHh26lZKFHSfUHq1D0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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