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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29982e742afe1f35c751246d0c431a0c81181bbf8aa3b600b15654121f639224' 
  AND token = 'Woa8+hwuw0p9ffo9gSE8xJFCGOJm8FO/SGW9km+cqhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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