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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1c68c4dbc2fc4fa6947375ff9c6cf573d8ede92ebe9ab21d077e48926750b86' 
  AND token = 'oaajYl+2RA14p6QOWyXu93hyozVbEGi479Mb/QRqWLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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