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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24968f5a88c0018def9d334ed1c75efb168753c077a466d2817b58cfe849bec6' 
  AND token = '/8sX+39XA2P2SzXn1k/2+R9uAs8Xe0m7lUb/HjtEiKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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