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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61c41cab8a92e0930779778911c353128dadac555e60e6dec15528b3f613e885' 
  AND token = '1SayWb7ExT9C5MyUOkzHJS/JtqfS+ZLCBXuvEjNZgRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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