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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2dfcda52e98221fe56a65f1b2fb3918b8c85321865a69360ed8ec04ebd04208' 
  AND token = 'Cky4/CF0bWSgVZp6Z3FSJ45CiQ4RMPAGC4k9odEO1I0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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