Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aec3a96ea2a12e081ea39b765e086dd7a7fbca7da801178989721ce8a5e5b38d' 
  AND token = 'zYFZPXBNCITYM0cfiNRZZrsMc7c7lERKcZsgHGIIMss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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