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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '634d3b503954a2176ce41ca7de26fe196a2332c5fd96d63b5d9a523ba9622297' 
  AND token = 'U/w3u/e4bdspfFMo1rgiYUXBEa4byMQRnX8A43GnEeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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