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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88191ebb174e2b8a766e655e492d39440efc17367374e077d27a2f877517ec5f' 
  AND token = 'seHeBtEj6qkcgSFASJ+76rXEBsPtyzCO81Zt89kmUC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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