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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aab898e4cd0ffd2baf5b9159f5189e0662fd94fd69b4936c36c98865f7a423ad' 
  AND token = 'iZQE95WCx9SdbkQLANFy9YxzlfgGviOhh7wawH7eAHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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