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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03af95d93a8e1d7e65dbef35036c917c0e6c6e720a80e734dd3cc5ccb02a7cd1' 
  AND token = 'vXs2+GkmuBroZU3W9TbvB2LqemYEo/++N5IYGZa4V3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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