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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '720300c13a95d4735a61bad7da5e16b83158dd0d8553d8ddf2a35d5f2e5e73d8' 
  AND token = '6ySkxONtZhwQmdwnvaWGgNGUaWT2Vh9lildXPoazOcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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