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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a32cd256f23f94e713f6d8edc64e179c0e5f71e584395fb7b56f9ad64b97da4d' 
  AND token = 'vRvvKDpvnVrb/alIVTi/0CNhzb0pV0v+/5OHlxZdnss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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