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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d1ccb89e6baea80094546e228cbf29076e3b97e821170f3a9b7d912159047a' 
  AND token = '2WkA03xyITV68nASdhe5MzFw47fMc/tpJMGzHvCnlDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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