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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25a57cbf3c3966aa1ec592595ebbea59344f42ea703f8d24ad93a28331a49151' 
  AND token = 'aTbR+Pbi/B4h+SuK0Z6FWnrLgeb+TQ0te9fqbo2qrJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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