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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ee6a4c03d52778cf532c0709b97be2a0dbdfd69862ef081e6c143567a054a67' 
  AND token = 'vJUYyl582MJe7rbtPWnr33169cx5JS2qYJph10sFRYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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