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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffdf8fee49736a8d92b979a7d6c54d63007c7ef7a0cbd6abd8852b8cdf7e7a1a' 
  AND token = 'gB8J+iWMK/CxhhIdVhMho7P9FCOyau5mHn4omY0f45g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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