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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bacadb21601c3dc06afc9c5c92425e575cbc2f1d596e853a4d0b146dae5cd224' 
  AND token = '0fg3V1xTnQL7jT6hHsAiMwEq3ww+YsjZ3/74IHuEcDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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