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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b24a9f68c4fdc3a21d616ceeb9b0379a947bc7fc5a2e42db2f17e934e16d9bf' 
  AND token = 'egZobaIFR1sosrOt0BE1qrgSxGVw8+dVdpAX7v8l3Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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