SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f95e9ca48915d9e2af78d6d6e2e6b35d150b1381728312e0c8f6fa59ed859a0' 
  AND token = 'Ls/XgpCvJIRloOpE0vIoXz4A3+gdXNblZ4Wc7PFpYUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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