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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cd74d04c7228cdc253edd789845ab5755448d59bd86f9cc619eec9d7bee23d6' 
  AND token = 'D/kNCl+8qaV7AyUDLLKu3f+bUdht0zj5GttnuzCWqv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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