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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfd3b269df67bf7a1cdc5f87102442e1b38ab6f38e4fb82df9229ddd06f75d32' 
  AND token = 'mv7YCZgfpjqIztYsRfqdUq2hCOY6x6mCD9Wfgu1BTdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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