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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36312fef424a326d0c9246d4a1480fc02557692f20d59f00a7b1e449849d0838' 
  AND token = 'iQO7DmgO2uC5nDcnOSTwqJz4FEinfvi/Tj2WuiTr3N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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