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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b20290fc26c8aa90e331bd02ab35560ad5dc8bd6d3cad0f3608c7bb9c535973' 
  AND token = 'OKIdk6n+0mo+Mw1yJOxyMBSH1qOzhTBPC/8AZTNM/pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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