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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9205a20e573686d398cba9ec6ed48189645c1e30022613a97c76164f369fbfdc' 
  AND token = 'yW+WgOPnCfit3tdtKoMliyThJ7Oe4xHhKAx5QH7ySog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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