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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0453c018f86be04a332b43b318e8782496103c69c5501960ba9f7d2eb7b97ef7' 
  AND token = 'KbugLbLEK1hcPO3X9Dt3mv8Xc34Sy2sYA2o98xOw7k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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