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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98689e1876721ce39c86eaa94c6799e7994815a3df5ffaa1998f9717ae557900' 
  AND token = 'p6rB8AEjUeR69uLWTu6qMWthut+AAVr3FaiId18+iZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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