SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '481d937e58d564890360a9dc9944fb54f32d99ae5aecd9a5921e3dd54843995e' 
  AND token = 'ltZmGl3VJ+dySrTKhXU/wikAvvaM+70gxrKYqUU/mjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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