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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d7f9632562ff22e7aa266f44288a4b39ee0931cfae918f1c890d078eef26176' 
  AND token = '0FWKbrk4p92sPyQHgnJAahIJp+XHomr7oUwPo1ZdVcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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