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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c977456e1dbd8f4d4889f4e33c613fe06d52dac3aa84a78482cdbefec73aac4' 
  AND token = 'cOXlX9V30mdOCQ0Yl2eNeWn5gibyEVJWMHNoqByk+CA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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