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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05928befc8c27e4887a21ab1aa4b7be904d2a6de325c75ad3db9a0d7ce83f55b' 
  AND token = 'aDCqXNN5nZ5eHJ9iG9j/6HNe70LMRHWHolTenKBt3Wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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