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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '253c6c3bd213b5811862907239b5155c7aba523c5c432825a66c7da9b6cfdc08' 
  AND token = 't67lAgsn09qg/LFSkbjQmxH0ODCV12BT6lIL27umj18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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