SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0ab47f574a321240e226cef04425781be7f3302f5c9ab719ceb2d31a92a9a59' 
  AND token = '00ZphzBiFjLxdn+NTWfxPTq55U7xgViM4gHywfPGJI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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