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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9e766b6722e767fab1c36bce112fd3e621bb23e6a59bdcd4ddb032b863d0825' 
  AND token = '51n8V7ZdZHw3QbNv2M+o4CtJ6davUBXktam8ptqA0Jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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