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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '231417fce4f51f11353b3a2b69f8b3463777331ab12daa4adb1732486eb3809a' 
  AND token = 'KiKQOVvvZXZCtp5nQ4KIx2EJNqsovT0qfLGelEG4T8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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