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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abd7d8b65fc870aaf4bca6bd25ba9357350e21df5358ede42cd1c92f7a9bda30' 
  AND token = 'j8070Ii43oVKle67pB+qMpYi4/AAx0utupkeiEsoyBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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