SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d0700635dfd9fe82814e3cf8aa90a4b8380c342b849954841c1337abee44f44' 
  AND token = '4Dn6V+Z2VGM1MMbEZrqYbS5JQqgpNBHaARnDwAJPjes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.47676

JSON explain

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