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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd56282a6067dba73636090f51a84986b9930c82ac1555444b7a5abd5f8d88afc' 
  AND token = 'GMhkAm5ZGtJOdjBJhvpmHsttLfdvDhbz8dZxx8G75hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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