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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aa4121ace2cd535e13e71db99c1b17db3fa261d905a33b4d77696de2c31e23d' 
  AND token = 'wH3irTxb1kfVM6HwL1Pzmb1mIjgredNrwyFoO2TtvnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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