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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aa49213e26af58445a72096d6302238905e0dea77b3ae1965881ae5ad6e5c70' 
  AND token = 'kfEkb49w8R4Z9/LBWX5RUDwqhgY/foxP00IPjSjP4SA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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